//
//  MacAddress.cpp
//  project
//
//  Created by 栗元峰 on 14-2-26.
//
//

#include "MacAddress.h"
#include <sys/socket.h> // Per msqr
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>

static MacAddress* instance = NULL;

MacAddress* MacAddress::getInstance()
{
	if (instance == NULL)
	{
		instance = new MacAddress();
	}
    
	return instance;
}

const char* MacAddress::getMacAddress()
{
	int                    mib[6];
	size_t                len;
	char                *buf;
	unsigned char        *ptr;
	struct if_msghdr    *ifm;
	struct sockaddr_dl    *sdl;
	
	mib[0] = CTL_NET;
	mib[1] = AF_ROUTE;
	mib[2] = 0;
	mib[3] = AF_LINK;
	mib[4] = NET_RT_IFLIST;
	
	if ((mib[5] = if_nametoindex("en0")) == 0) {
		printf("Error: if_nametoindex error/n");
		return NULL;
	}
	
	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
		printf("Error: sysctl, take 1/n");
		return NULL;
	}

	if ((buf = (char*)malloc(len)) == NULL) {
		printf("Could not allocate memory. error!/n");
		return NULL;
	}
	
	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
		printf("Error: sysctl, take 2");
		return NULL;
	}
	
	ifm = (struct if_msghdr *)buf;
	sdl = (struct sockaddr_dl *)(ifm + 1);
	ptr = (unsigned char *)LLADDR(sdl);
	NSString *outstring = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
	//NSString *outstring = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
	free(buf);
    
	return [[outstring uppercaseString] UTF8String];
}
